Group,
I just received my new custom pistons from Venolia. Nice. They are for a 3.248 in (82.5 mm) bore. I think Jarrid suggested this size- thanks.
The note accompanying the pistons recommended a piston clearance of 0.005 to 0.007 (bottom of skirt) and said "These clearances are for racing use ... They may be altered slightly to best suit individual needs" .
I note the original factory clearance is a much tighter 0.0004 to 0.0015. I won't be racing this car, but it will have Vizard mod, Delta KB cam, stroked 0.010 (to 3.35"), and of course bored to 3.248. I do plan on 20,000 miles of high speed running - 3500 rpm with 3.89 and OD- over the next 5 years.
Any suggestions? Or even just help me understand the tradeoffs of more or less clearance. I'll also be getting some advice from my machine shop, but they are a racing motor outfit and not necessarily tuned to old British sports cars.
Thanks,
Tom
I just received my new custom pistons from Venolia. Nice. They are for a 3.248 in (82.5 mm) bore. I think Jarrid suggested this size- thanks.
The note accompanying the pistons recommended a piston clearance of 0.005 to 0.007 (bottom of skirt) and said "These clearances are for racing use ... They may be altered slightly to best suit individual needs" .
I note the original factory clearance is a much tighter 0.0004 to 0.0015. I won't be racing this car, but it will have Vizard mod, Delta KB cam, stroked 0.010 (to 3.35"), and of course bored to 3.248. I do plan on 20,000 miles of high speed running - 3500 rpm with 3.89 and OD- over the next 5 years.
Any suggestions? Or even just help me understand the tradeoffs of more or less clearance. I'll also be getting some advice from my machine shop, but they are a racing motor outfit and not necessarily tuned to old British sports cars.
Thanks,
Tom